Shiftable flexible sheet securing device



March 13, 1956 E. GERICKE 2,737,887

SHIFTABLE FLEXIBLE SHEET SECURING DEVICE Filed April 24, 1952 I 2 Sheets-Sheet l Ff. w 1 7 1/ 1 I]. l

Fig. 3 -J- .9

l i I F/ 10 WK 1 7 l g 5 Inventor rfe G I37 J Law/M United States Patent Zlheiinvention relates to,a;fiaingsdeyiee-iformetalsheets,

ainwlziich the :metak :sheet 1 ;that his tfixed to. .a-elamping :mtrip;isadisplaceable ontthefformcylinder.

.2 lthrfllider athat-dt should. be possible, to obtain anaciicurate fittandemiaccuratetadjustment,the metalsheetrmust .r laetflisplaeeable in @everyrdirection, i.'te.,.:alsoain.an oblique .tdireetion. .Thesiiisplacement ref. ;the .tmetaltsheet iinathe direction or sill ;the,idire.ction opposite-1o. :.the. dir.ection 10f mnningr1o zthe' storm cylinder zisnusually eflectedvby ozotatingjthe-zform zeylinderzion .itsria-xle. In ithe. knownidevices, for the purpose of transverse and Oblique setting,

irsczewsmr other ielamping members .have do :be loosened I .inzunost :cases, even; .the metal :sheet, whieh-tdoesstnot .t0.abe :shiftedihas :tt) be JOQSQUQd-ctifi order; .t-hat,-,it mhnuldbe possible zto displace zthe metal; sheet =whileheipg a-kept zfreeiromiolds. llhe tightening total-he :screws. must alrenutheseifeccted :by :feel; rthis; howeyer, acquires. a grea :1 heal-10f experienceaaird,;frequently,..ashendingtpttthesmetal wisheemakesrplace.

.ilihe :invention provides-a ifixing. device, in whichsthe sion in the desired position, clamped on the cylindersfree from folds and bends, thus straightening itself.

The charaeteristic tfeature t of "the inventionzconsists in mounting each "10f the 'two rclamping strips in a swivel hearing, which is displaceable preferably in the direction o'fthe axis of the form 'cylinder and about which-the corresponding clamping strip is rockable in a plane in which the clamping edge of the form cylinder is located.

The invention is represented by way of example by the accompanying drawings, of which:

Figure 1 is a section through the form cylinder of an offset machine with a metal sheet fixed thereon;

Figure 2 is an elevation of the clamping device represented in Figure 1, as seen from the right-hand side of Figure l, the right-hand end of the metal sheet being displaced downwards;

Figure 3 is a diagrammatic representation of a normally fixed metal sheet;

Figure 4 is a diagrammatic representation of a metal sheet in which the two ends have been displaced in opposite directions; and

Figure 5 is a diagrammatic representation of a metal sheet in which the two ends are displaced to the same side.

The clamping device is, as usual, accommodated in the gap of the oflfset cylinder 1. The metal sheet 2 is, at its front edge 3 and at its rear edge 4, held by two hook strips or clamping strips 5 and 6 which lie slidingly on the two supporting rails 7 and 8. The hook strips 5 and 6 are of angular shape. The strips 5 and 6 are mounted at their mid-points by swivel bearings in the form of ball-and-socket joints 9 and 10 respectively, of which the swivel bearing 9 is mounted on a lever 11,

and a swivel bearing 10 is mounted on a lever 12. ,The 7 2,737,887 Patented Mar. 13, 1956 12 111 :is: :mountedonv-asslidinzwaniece =14 bysa'rllill Z13 --=whilst.;theilever .112 isamountedmnzarslidinamiece 11.6.1123 .;a :pin 1-5. ;-;In additiqnrthesleternllthaszapin Island-the rleuer .12 hasaaain-IS. filhepins Hand :18 are cemented 5 aogether by a spning .19, so. that ends-of .zth ilever Aland. .12 are :pressed against a ielampingtserew 120 bythe aetienzotthis spring. 19. v

I. By ;tightening. hTlQ W 2&9, tile ilexers 11 and .1132 ar motated :abontizheir. spins Id and Ilia-and etthein allrand- 1o socket joints 9 and 10 agafmsethethookrsttips and @smthanthe :metalzsheetziszannlied :tathesurfiace Qf h eylindenand is clamped firmly thereon. v

FJIhe sliding. iece, 14 is, guided won .the pinszzl sand .22 which iengagerimim slats seam 24 in; he-sl dingzpieee. 15 displacementnf zthezslidingstziece steifected hymn 'reecentric :EIEhe sliding piece. :16 is "guided-Q11, 42 1 512 sand .27 which engage in.- heS;sletsl2-8and:29-.in the slidin apiece. .The nisplacement nfrthesli ing p flceilo isrefiee ed ;;-b.y anaeceentric .31). -When :the eccentrics .25 and :30 are 20 rotated,athesbearing pqsitions fsthe;hall=and=socket-:ioints i;9-;an.d: 3101MB displ cedzzandizthe hock strips: are :set tob- ;1liquely.z.insaccor.dance withzthedateraladi placement ntrth sliding :pieceslla sand .sAfter itighteningz he clamp n sscrew .20, metalvsheetiaf :lies :clamned on :the Jam cylinder. V

raQnnheadiustmentrasishown :iniiiigure 2, @the. ball-end- :zsocket ioint =10 thas :beenmisplaced-stewards -tbe deftby lithe. .zdeizice hereinbeforewdesetihed, s :tha an blique aposition, twisted to sthe sight of thee-metal sheet 2. is

g tplifldllqd.

izFigure 3: :represents stile mermal rpositimmof she metal ::sheet,..:.-in which thewbalband-socket- 'iQints:-.9 and zlllwtl .Llllii plane, whichsnasses throughz-the clamping sewn/s29,

v sperpendieularwtoethe cylinder x111 Figure (A-flllbfi ball-.andssocket rieint v 1.0;hasheendis laced-gtoabeiright {bunt-he hallsandrsoeket.j int!Ihasbeen iddlsplaGed fitO the left,zsoathatianzobliauelmwisted position L-iflf the metalisheet isprodueed.

In :EigurefS, .:the -two i-ba-1l 'and-soche joints-: and :1

40 have been displacemtoithealeft:bxnhaxecentriea ZS-an 3,0,-::so: :that irthemeta1aheetmas been --tmo.ued .zuniformly roster thetcylinderzl.

2 .xlnzorder .to tsliiftathe metalzsheet lttheaclampingzscrew ralkisailoosened; :the teccentries JZSzand {30 :are shifted un i tthetdesiredaposition:tot-sheametal she t his r fihfi led, an the clamping screw 20 is again tightened, so that in this way the metal sheet is tightly applied to the cylinder 1.

What I claim is: 1. A device for fixing metal sheets on offset machines,

comprising two clamping strips adapted to have a metal sheet fixed thereto, said metal sheet being displaceable on the form cylinder by shifting said clamping strips, two displaceable swivel bearings in which said clamping strips are respectively mounted and about which said clamping strips are respectively rockable in a plane containing the clamping edge of the form cylinder, two sliding plates and eccentrics for displacing said sliding plates, said swivel bearings being respectively arranged on said sliding plates.

2. A device for fixing metal sheets on olfset machines, comprising two clamping strips adapted to have a metal sheet fixed thereto, said metal sheet being displaceable on the form cylinder by shifting said clamping strips, two displaceable swivel bearings in which said clamping strips are respectively mounted and about which said clamping strips are respectively rockable in a plane containing the clamping edge of the form cylinder, two sliding plates and eccentrics for displacing said sliding plates, said swivel bearings being respectively arranged on said sliding plates and being movable on said sliding plate for fixing said metal sheet.

3. A device for fixing metal sheets on offset machines,

r s 1 v 3 comprising two clamping strips adapted to have a metal sheet fixed thereto, said metal sheet being displaeeable on the form cylinder by shifting said clamping strips, two displaeeable swivel bearings in which said clamping strips are respectively mounted and about which said clamping strips are respectively rockable in a plane containing the clamping edge of the form cylinder, two swivel plates on which said swivel bearings are respectively arranged, two sliding plates respectively hinged to said swivel plates, eccentrics for displacing said sliding plates, and, arranged on the form cylinder, clamping means for regulating the shifting of said swivel plates and the clamping of said metal sheet caused by said shifting.

4. A device for fixing metal sheets on ofiset machines, comprising two clamping strips adapted to have a metal sheet fixed thereto, said metal sheet being displaeeable on the form cylinder by shifting said clamping strips, two displaeeable swivel hearings in which said clamping strips are respectively mounted and about which said clamping strips are respectively rockable in a plane containing the clamping edge of the form cylinder, two swivel plates on which said swivel bearings are respectively arranged, two sliding plates respectively hinged to said swivel plates, eccentrics for displacing said sliding plates, and, arranged on the form cylinder, a clamping device for regulating the shifting of said swivel plates and the clamping of said metal sheet caused by said shifting, said clamping device being common to said two swivel bearings.

5. A device for fixing metal sheets on offset machines, comprising two clamping strips adapted to have a metal sheet fixed thereto, said metal sheet being displaeeable on the form cylinder by shifting said clamping strips, two displaeeable swivel bearings in which said clamping strips are respectively mounted and about which said clamping strips are respectively rockable in a plane containing the clamping edge of the form cylinder, two swivel plates on which said swivel bearings are respectively arranged, two sliding plates respectively hinged to said swivel plates, eccentrics for displacing said sliding plates, and arranged on the form cylinder, a clamping device for regulating the shifting of said swivel plates and the clamping of said metal sheet caused by said shifting, said clamping device being common to said two swivel plates.

6. A device for fixing metal sheets on offset machines, comprising two clamping strips adapted to have a metal sheet fixed thereto, said metalsheet being displaeeable on the form cylinder by shifting said clamping strips, two swivel bearings which are displaeeable in the direction of the axis of the form cylinder and in which said clamping strips are respectively mounted and about which said clamping strips are respectively are respectively rockable in a plane containing the clamping edge of the form cylinder, two swivel plates on which said swivel bearings are respectively arranged, two sliding plates respectively hinged to said swivel plates, eccentrics for displacing said sliding plates, and arranged on the form cylinder, clamping means for regulating the shifting of said swivel plates and the clamping of said metal sheet caused by said shifting.

7. A device for fixing metal sheets on offset machines, comprising two clamping strips adapted to have a metal sheet fixed thereto, said metal sheet being displaeeable on the form cylinder by shifting said clamping strips, two swivel bearings which are displaeeable in the direction of the axis of the form cylinder and in which said clamping strips are respectively mounted and about which said clamping strips are respectively rockable in a plane containing the clamping edge of the form cylinder, two swivel plates on which said swivel bearings are respectively arranged, two sliding plates respectively hinged to said swivel plates, eccentrics for displacing said sliding plates, and, arranged on the form cylinder, a clamping-device for regulating the shifting of said swivel plates and the clamping of said metal sheet caused by said shifting, said clamping device being common to said two swivel bearings.

8. A device for stretching flexible sheets on the form cylinder of offset machines comprising clamping strips provided for tightening and loosening said sheets, swivel bearings arranged transversely to the axis of the form cylinder for swinging said strips, whereby on displacement of the axis of the form cylinder of the oflfset machine angle displacements of a flexible sheet may be counterbalanced, a lever on which each swivel bearing is mounted, a sliding piece displaeeable in the direction of the axis of the form cylinder for guiding each lever and by the shifting of which the tightening or loosening of the sheets is facilitated and eccentrics engaging said sliding pieces for causing a displacement of said sliding pieces.

References Cited in the file of this patent:

UNITED STATES PATENTS 2,012,972 Osborn Sept. 3, 1935 

